Blame asteroid for demise of dinosaurs, not volcanoes

Artist’s illustration depicting the Chicxulub asteroid impact 66 million years ago in what is now the Gulf of Mexico. A new study said this massive impact, and not volcanoes, was the primary cause of the demise of dinosaurs around the globe. Image via Don Davis/ NASA/ Wikimedia Commons (public domain).

• How did the dinosaurs go extinct 66 million years ago? The two main possibilities have been a massive asteroid strike and volcanoes. Could it even have been both?
• The Chicxulub asteroid...